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find SNR of a noisy signal.

Asked by yihui on 30 Sep 2013
Latest activity Commented on by Image Analyst on 1 Oct 2013

i have a noisy signal,can i just use this signal to calculate the snr?if so could somebody tell me what i should do?Thanks in advance

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Answer by Image Analyst on 30 Sep 2013

You need to find the noise, and the signal. You can estimate them if you want, but to get the ratio you need each of them separately.

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yihui on 1 Oct 2013

so how i estimate them?

Image Analyst on 1 Oct 2013

You can use conv() to smooth your signal with a box filter. But if you don't know your true signal then you won't know how much to smooth it. I guess you could just eyeball it and go with whatever you think looks good.

smoothedSignal = conv(noisySignal, ones(1, windowWidth)/windowWidth, 'same');
Image Analyst

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